[calmon]

I agree with Endoperez, its strange to see a battle where 100 bowman can't hit a single commander with a parry 9 shield.

There should be something like in the melee defense roll: A multiple attack penalty.

I'm fine when a magic shield blocks 99% of a single bow attack. But if 20-30 arrows hits the position in a single combat turn there should be a penality. The defender just can't block everything with his shield.

Maybe the -2 multiple attack penalty (from melee battle) should work fine here. Every attack after the first gives -2 to the defender die roll.